Bulldozer.



C. H. HAMILTON. f

BULLDOZER.

APPLicATloN vman 1uLY|9.1911.

1,280,991 v Patented Oct. 8, 1918.

4 SHEETS-SHEET l.

mit-M C. H. HAMILTON.

BULLDOZER.

APPLICATlON FILED JULY I9. i917.

Patented Oct. 8, 1918.

4 SHlTIETS-SHEET 2.

diaries fw C. H. HAMILTON.

BULLDOZER.

APPLICATION FILED IuLY I9. 1911.

1,280,991. Patented. oet. 8, 1918.

4 SHEETS-SHEET 3.

(f/4 m. ,A f1/am aan,

C. H. HAMILTON.

BULLDOZER.

APPLICATION FILED IULY I9 |917.

Patented 001;. 8, 1918.

4 SHEETS-SHEET 4 CHARLES H. HAMILTON, OF AURORA, ILLINOIS.

BULLDOZER.

Specification of Letters Patent.

Patented-oct. s, 191s.

Application led July 19, 1917. lSerial N o. 181,562.

To all whom z't may concern.' Be it known that I, CHARLES H. HAMIL- TON, a citizen of the United States, and a resident of the city of Aurora, county of Kane, and State of Illinois, have invented certain new and useful Improvements in Bulldozers, of which the following is a specification.

My invention relates to improvements in bull dozers, and has for its object the provision of an improved construction of this character. by means of which articles of various shapes may be readily and expeditiously formed.

The invention consists in the combinations and arrangements of parts hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawings forming a part of this specification, and in which,

V Figure 1 is a top plan view of a bull dozer embodying my construction,

Fig. 2, a longitudinal section of the same,

ig. 3, a perspective view of a bracket formed in the bull dozer, illustrated in Figs. 1 and 2;

Fig. 4, a transverse section of the bull dozer,

Fig. 5, another transverse section of the same,

Fig. 6, a bottom plan view of a portion of the bull dozer,

Fig. 7, a top plan View of the bull dozer equipped andadjusted to form a different shaped article,

Fig. 8, a view of said article detached,

Fig. 9, a top plan 'view of the bull dozer adjusted and equipped to form another article of different form, and

Fig 10, a view of the last mentioned article detached.

The preferred form of construction as illustrated in the drawings comprises a suitable bed plate 11 arranged to be positioned on the bed 12 of an ordinary bull dozer, between the abutments 13 thereof and the ordinary reciprocating cross head 14.

AA stationary die head 15, substantially I triangular in form, is adjustably secured centrally on the bed plate 11 by means of bolts 16 passed through the die head and slidably engaging angularly ositioned T-slots 17 in the plate 11. AdJacent. the die head 15 the plate 11 is provided with a slidable bed plate portion 18, slidable in a suitable recess formed in the bed plate 11 and equipped with T-slots 19 for mounting of a slldable die -head 20 thereon by means of bolts 21 engaging slots 19. The plate 18 1s'connected with a bar 22 by means of screw bolts 23, the other end of bar 22 carrying a lug 24 connected with the lower end of a lever 25, pivoted at 26, toa block 27 carried by bed plate l1. The upper end of lever 25 1s connected with the lower end of a lever 28,'p1voted at 29 on block 27 and connected at 1ts upper end by means of a link 30 with an upstandmg post or bar 31 on the cross head 14. V

The arrangement is such that upon forward movement of the cross head 14, the slidable die head 20 is shifted away from the die head 15, thus, in effect, expanding the die formed by said die heads, and upon rearward movement of the cross head 14 the die head 20 will be moved towardthe die head 15 thus, in effect, retracting or collapsing the die head. A slidable die 32, substantially triangular 1n form, is arranged to coperate with the forward corner of the die headl 15, the d ie 32 being operated by means of an arm 33 connected with-a lever 34, pivoted at 35, to the bed plate 11, and connected at its upper end by means of a link. 36 with the lever 28. Another lever 37 is connected with lever 28 and also with a rocker arm 38 on a rocker shaft 39 carrying a gage arm 40, said gage arm being arranged .to coperate with the die heads to properly position the work in the bull dozer. By this arrangement it will be observed that upon forward movement of the cross head 14, the die 32 will be forced into operative engagement with the forward corner of die head 15 and the gage arm 40 rocked forwardly and upwardly to re-l lease the work for bending about the die heads. Swinging die -arms 41 and 42 are pivoted at 43 on the bed -plate 11 and are connected by links 44 with the cross head 14, whereby operation of the cross head swings said die arms into and out of opera tive relation with the die heads 15 and 20.

In the arrangement disclosed in Fig. 1, die

susl

arm 41 carries a die member 45 arranged to coperate with the corresponding side of die head 15, and a die member 46 arranged to coperate with a corresponding twisting die member 47 to twist the endA of the member being operated upon, as indicated in Fig. '3. Die member 47 is carried by .a block 48 on an adjustable abutment member` 49 adjustable by means of bolts 50 engaging either ot' the slots 17, and a supplemental adjusting slot 51, as shown. Die arm 42 carries a die having a portion 52 cooperating with the corresponding side ot' die head 15 and` a portion 53 coperating with the corresponding sides or portions of die 'head 2O as indicated` said parts eoperating to form a bracket 54, illustrated in Figs. 3. from a stright strip of metal such as wrought iron at a single operation. As the die arms 41 and 42 swing inwardly to eoperate with the die heads 15 and 20, the die head 20 is also moved forward to operative position, but upon rearward movement of the cross head 14 and outward swinging of the die arms 41 and 42, the. die head 20 will be moved or retracted forwardly to relieve the pressure on the inwardly bent end of the bracket 54 to permit of its ready removal.

In Fig. 7 I have illustrated an arrangement by means 'of which a bracket, such as is illustrated in Fig. 8, may be formed. Here specially arranged die blocks are mounted on the die arms 41 and 42 and abutment member 49 is adjusted as indicated and is also equipped with a die block, and slightly different forms of die heads are substituted for die heads 15 and 20, as shown in Fig. 1. This arrangement readily produces a bracket 55, as illustrated in Fig. 8.

In Fig. 9 the necessary parts and adjustments are illustrated for forming a bracket 56, as illustrated in Fig. 10.

Various other forms of dies may be attached to the swinging arms 41 and 42 and to the abutment member 49, producing various shapes as desired.

While I have illustrated and described the preferred forms of construction for carrying my invent-ion into eiiect, these are capable of variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come Within the scope of the appended claims.

Having described my invention what I claim as new and desire to secure by Letters Patent is:

1..A bull dozer comprising a die head made in two parts arranged to be separated and spread apartinto operative position and drawn together to release the work; a die member coperating therewith to form objects about the same; and means for spreading apart said die head members prior to the forming` operation and drawing them together after said operation, substantially as described.

2. A bull dozer comprising a bed plate; a bed plate portion slidable on said bed plate; means on said bed plate portion for removably mounting vario/us die head parts; means on the bed plate proper for mounting copcrating die head parts; die vmembers coperatiiig with said die head parts; means for sliding said bed plate portion to separate and approach said die head parts; and means for applying said die members to said die head pa rts when separated, substantially as described.

3. A bull dozer comprising a bed plate: a bed plate portion slidable on said bed plate; T-lots in said bed plate portion for removably mountingvarious die head parts; T- slots in the bed plate proper for mounting the eoperating die head parts; die members coperating with said die head parts; means for sliding said bed plate portion to separate and approach said die head parts; and means for applying said die members to said die head parts when separated, substantially as described.

4. A bull dozer comprising` a bed plate; a bed plate member slidable on said bed plate; means on said bed plate portion for removably mounting various die head parts; means on the bed plate proper for mounting cooperating die head parts; die members coperating with said die head parts; means for sliding said bed plate portion to separate and approach said die head parts; means for applying said die members to said die head parts when separated; and an labutment member on said bed plate cooperating with said die and die head parts, substantially as described.

5. A bull dozer comprising a bed plate; a bed plate portion slidable on said bed plate; T-slots in said bed plate portion for removably mounting various die head parts; T-slots in the bed plate proper for mountingl the coperating die head parts; die members coperating with said die head parts; means for sliding said bed plate portion to separate and approach said die head parts; means for applying said die members to said die head parts when separated, and an abutment member on said bed plate cooperating with said die and die head parts, substantially as described.

6. A bull dozer comprising a bed plate; a. stationary die head on said plate; a die head slidable toward and away from said stationary die head; a pair of swinging die arms on said bed plate and coperating with said die heads; a slidable die between said arms and coperating with said statitonary die head; an abutment member adjustable on said bed plate coperating with said die heads; a gage arranged to coperate with said stationary die head to position work thereon; a reciprocating cross head; links 7. A bull dozer comprising a bed plate, there being T-slots therein for mounting a stationary die head; a stationary die head mounted in said T-slots; a bed plate portion slidable on said bed plate cooperating with 'said stationary die head, there being T-slots in said bed plate for mounting a die head thereon; a die head mounted in the T-slots on said plate and coperating with said stationary die head; swinging die members eoperating with said die head parts; and means for operating said die members and said slidable bed plate portion, substantially as described.

8. A bull dozer comprising a bed plate, there being T-slots therein, for mounting a stationary die head; a Stationary die head mounted in said T-slots; a bed plate portion slidable on said bed plate eoperating with said stationary die head, there being T-slots in said bed plate for mounting a die head thereon; a die head mounted in the T-slots on said plate and coperating with said Stationary die head; swinging die niembers coperating` with said die head parts; and an abutment member on said bed plate eoperating `with said die head parts, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribingr Witnesses.

CHARLES H. HAMILTON.

Witnesses:

JOSHUA R. H. Po'r'rs, B.` G. RICHARDS. 

